| Hans Automotive Ltd | Wholesale & retail | 2023 |
| Harbord Road Developments Limited | Construction | 2025 |
| Harlow House Management Company Ltd | Households | 2025 |
| Harobed Seira Ltd | Real estate | 2025 |
| Harper & Harper Ltd | Construction | 2024 |
| Harrier Home Improvements Ltd | Other services | 2024 |
| Harris Venison & Co Limited | Agriculture & fishing | 2016 |
| Harrow Yard (Tring) Residents Management Company Limited | Households | 2006 |
| Hartoak Limited | Real estate | 1996 |
| Haselwood LPD Ltd | Professional & scientific | 2025 |
| Hatch Creative Spaces Ltd | Other services | 2021 |
| Have I GOT Brews for YOU Ltd | Wholesale & retail | 2021 |
| Hawker Aviation Ltd | Transport & logistics | 2015 |
| Hawkers (Holdings) Limited | Financial services | 2023 |
| Hawkers (Investments) Limited | Financial services | 2023 |
| Hawkers (Property) Limited | Real estate | 2023 |
| Hawkins Equestrian Limited | Wholesale & retail | 2018 |
| Hayden Media Ltd | Information & communication | 2019 |
| Hayward Homes Properties Ltd | Real estate | 2021 |
| Hazel Beckett Ltd | Professional & scientific | 2023 |
| HDH Physio Ltd | Health & social care | 2015 |
| Headguard C.I.C. | Education | 2025 |
| Healey Holidays Ltd | Real estate | 2023 |
| Healing Jesus Campaign Lighthouse Chapel International | Other services | 2014 |
| Health and Safety Services (UK) Limited | Professional & scientific | 2002 |
| Healthypr Limited | Administrative & support | 2008 |
| Heat Source Engineers Limited | Construction | 2025 |
| HEB Display Ltd | Manufacturing | 2025 |
| Hedges Ground Maintenance Limited | Administrative & support | 2014 |
| HELIV8 Ltd | Professional & scientific | 2020 |
| Hello YOU Media Ltd | Information & communication | 2009 |
| Helping Hands Hippotherapy Ltd | Health & social care | 2021 |
| HEN Popti Ltd | Real estate | 2021 |
| Hendrix Media Limited | Information & communication | 2012 |
| Hering Health Limited | Health & social care | 2023 |
| Herts Beds & Bucks Roofing Services Ltd | Construction | 2015 |
| Hexagon Designs Ltd | Professional & scientific | 2023 |
| HFT (2) Holdings Limited | Financial services | 2025 |
| HFT (3) Holdings Limited | Financial services | 2025 |
| HFT (UK) Holdings Limited | Financial services | 2025 |
| HH Installations and Maintenance Limited | Administrative & support | 2018 |
| HI Demand Ltd | Wholesale & retail | 2024 |
| Hickford Construction Limited | Construction | 2014 |
| Hidden Pixel Limited | Information & communication | 2008 |
| High House Marina Limited | Other services | 1994 |
| High Launch Golf Ltd | Wholesale & retail | 2025 |
| Higher Ground Holdings Ltd | Financial services | 2020 |
| Highest Impact Limited | Education | 2025 |
| Hills Plumbing & GAS Services Ltd | Construction | 2019 |
| Hin's Kitchen Ltd | Hospitality | 2022 |
| Historic Racing and Sports Car Club Limited | Extraterritorial | 2002 |
| Historic Racing Car Club Limited | Extraterritorial | 2002 |
| Historic Sports and Racing Car Club Limited | Extraterritorial | 2002 |
| Historic Sports Car Club Limited | Arts & recreation | 2002 |
| Hitek Scaffolding Ltd | Construction | 2019 |
| Hoffingham Limited | Administrative & support | 2014 |
| Holland Secure Services Ltd | Other services | 2019 |
| Hollie MAE Ltd | Extraterritorial | 2021 |
| Holly Consulting Ltd | Professional & scientific | 2021 |
| Holmesdale Estates Limited | Real estate | 2020 |
| Holmesdale Finance Limited | Financial services | 2017 |
| Home Fires & Stoves Ltd | Other services | 1993 |
| Home of the Roast Ltd | Professional & scientific | 2019 |
| Hooked on Line Limited | Wholesale & retail | 1999 |
| Hoole House Limited | Real estate | 2020 |
| Horbus Ltd | Professional & scientific | 2024 |
| Horizon.Online Limited | Wholesale & retail | 2017 |
| Hospitality Leisure Partnership Limited | Professional & scientific | 2015 |
| House and Farm Services Limited | Administrative & support | 2010 |
| Howe and Co RM Ltd | Hospitality | 2016 |
| HP-SPV-01 Limited | Real estate | 2025 |
| HP-SPV-02 Limited | Real estate | 2025 |
| HP-SPV-03 Limited | Real estate | 2025 |
| HPD Technologies Ltd | Professional & scientific | 2026 |
| HPW Autos Ltd | Wholesale & retail | 2025 |
| HR Results Ltd | Administrative & support | 2020 |
| HS Rental Management Ltd | Real estate | 2025 |
| Hub Church South Woodford | Other services | 2018 |
| Hughes Defence Sales Consultancy Limited | Extraterritorial | 2023 |
| Hughes Tiling Ltd | Construction | 2015 |
| Hunter Family Holdings Ltd | Information & communication | 2020 |
| Hunts of Greens Norton Limited | Wholesale & retail | 2012 |
| HWB Group Holdings Limited | Financial services | 2021 |
| HWB Group Ltd | Professional & scientific | 2005 |
| Hwbc Limited | Construction | 2022 |
| HWG Ltd | Hospitality | 2018 |
| Hygge Children’S Social Care Limited | Health & social care | 2023 |
| Hypercubic Solutions Limited | Information & communication | 2002 |
| Hypex Racewear Ltd | Wholesale & retail | 2020 |
| I Find Global UK Ltd | Wholesale & retail | 2024 |
| I-Ingredients Ltd | Wholesale & retail | 2012 |
| I-Inspire Health Ltd | Wholesale & retail | 2013 |
| IAN Bodily Building Services Limited | Construction | 2011 |
| IAN Gough Associates Limited | Professional & scientific | 2004 |
| Iceni Renew Ltd | Real estate | 2025 |
| IDT Group Limited | Financial services | 2019 |
| Ie-Technology Ltd | Manufacturing | 2025 |
| Ignition Collective Limited | Administrative & support | 2013 |
| Ignition Engineering Ltd | Professional & scientific | 2024 |
| Imagine Wellbeing Ltd | Administrative & support | 2012 |